Hello,
I've seen lost key finders that respond to sound by beeping. Does anyone know how they work? Are they responsive to a specific frequency? Is it hard to build your own (I don't have much experience with analog circuits)? Could it be made to respond only to non-audible frequencies?
Thanks
I've seen lost key finders that respond to sound by beeping. Does anyone know how they work? Are they responsive to a specific frequency? Is it hard to build your own (I don't have much experience with analog circuits)? Could it be made to respond only to non-audible frequencies?
Thanks